The WDM-side signals of the TN11LSX/TN12LSX board can be regenerated using another TN11LSXR board.
The WDM-side signals of the TN13LSX/TN14LSX board can be regenerated using the TN12ND2/TN52ND2/TN53ND2/TN57ND2/TN55NO2/TN55NH2/TN53NQ2/TN54NQ2/TN57NQ2 board.

The cross-connect board is not mandatory in this scenario. If the cross-connect board is configured, you can configure pass-through services to achieve electrical regeneration. If no cross-connect board is configured, you can configure ND2 in electrical regeneration mode to achieve regeneration of OTU2 and OTU2e signals.